Thomas Emmet Hayden (December 11, 1939 – October 23, 2016) was an American social and political activist, author, and politician. Hayden was best known for his role as an anti-war, civil rights, and intellectual activist in the 1960s, becoming an influential figure in the rise of the New Left. As a leader of the leftist organization Students for a Democratic Society, he authored the Port Huron Statement, helped lead protests at the 1968 Democratic National Convention, and stood trial in the resulting "Chicago Seven" case.

In later years, he ran for political office numerous times, winning seats in both the California State Assembly and California State Senate. At the end of his life, he was the director of the Peace and Justice Resource Center in Los Angeles County. He was married to Jane Fonda for 17 years and is the father of actor Troy Garity.

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